Standard-Compliant Low-Pass Temporal Filter to Reduce the Perceived Flicker Artifact Articles uri icon

publication date

  • November 2014

start page

  • 1863

end page

  • 1873


  • 7


  • 16

International Standard Serial Number (ISSN)

  • 1520-9210

Electronic International Standard Serial Number (EISSN)

  • 1941-0077


  • Flicker is a common video-compression-related temporal artifact. It occurs when co-located regions of consecutive frames are not encoded in a consistent manner, especially when Intra frames are periodically inserted at low and medium bit rates. In this paper we propose a flicker reduction method which aims to make the luminance changes between pixels in the same area of consecutive frames less noticeable. To this end, a temporal low-pass filtering is proposed that smooths these luminance changes on a block-by-block basis. The proposed method has some advantages compared to another state-of-the-art methods. It has been designed to be compliant with conventional video coding standards, i.e., to generate a bitstream that is decodable by any standard decoder implementation. The filter strength is estimated on-the-fly to limit the PSNR loss and thus the appearance of a noticeable blurring effect. The proposed method has been implemented on the H. 264/AVC reference software and thoroughly assessed in comparison to a couple of state-of-the-art methods. The flicker reduction achieved by the proposed method (calculated using an objective measurement) is notably higher than that of compared methods: 18.78% versus 5.32% and 31.96% versus 8.34%, in exchange of some slight losses in terms of coding efficiency. In terms of subjective quality, the proposed method is perceived more than two times better than the compared methods.


  • Telecommunications


  • flicker artifact; flicker reduction; h.264/avc; low-pass temporal filtering; motion-guided temporal filtering; on-the-fly filter strength control; standard compliant